/Engine/Plugins/Online/OnlineFramework/Source/Party/Public/Chat/SocialChatMessage.h
FSocialUserChatMessage ( [USocialUser](API\Plugins\Party\User\USocialUser) & Sender, const [FString](API\Runtime\Core\Containers\FString) & MessageBody, [ESocialChannelType](API\Plugins\Party\Chat\ESocialChannelType) InSourceChannelType )